The analysis of historical accident data includes the examination of accident data from 3 to 5 full calendar years in terms of characteristics such as severity, accident types, frequency, rates, models, clusters and contributing factors. Overwrite charts such as heat maps, bar charts, and other cards that graphically represent overwrite stress locations are used to interpret the data. An accident rate is the number of accidents that occur at a given location during a given period of time, divided by the level of exposure. The accident rate is calculated per 100 million VMT using the following formula: Let`s take an example:What will be the AADT (Average Annual Daily Traffic) for an 800 km motorway, provided that the traffic data collected by the sensors indicates that the total number of vehicles going back and forth on the motorway in one year, 4380546. AADT Step-by-step calculationStep 1: Assign specified valuesTotal vehicle traffic volume for 1 year = 4380546Step 2: Replace the values of the formula Average Annual Daily Traffic (AADT) = (total volume of vehicle traffic for 1 year) / 365 days = 4380546/365 = 12001.4 vehicles/ dayAnnual average daily traffic (AADT) for this particular highway is 12001.4 vehicles per day. Speed is one of the most important factors that travelers consider when choosing other routes or means of transport. The speed of vehicles on a road, in addition to the capabilities of drivers and their vehicles, depends on five general conditions: the physical characteristics of the roadway, the extent of disturbances on the side of the road, the weather, the presence of other vehicles and speed limits (set by law or by traffic control devices). While one of these factors can determine cruising speed, the actual driving speed on a facility typically reflects a combination of these factors. Running speed. The speed at which a single vehicle travels on a stretch of highway is called driving speed. Walking speed is the length of the highway section divided by the time a typical vehicle has to cross the section. For extended sections of track that include several types of roads, average driving speed is the most appropriate measure to assess service levels and costs for road users. The average driving speed is the sum of the distances travelled by vehicles on a stretch of motorway during a given period divided by the sum of travel times.